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(Nb Model.) 3Sheets-Sheet 1.

C. SPIRO. ART OF PHOTOGRAPHING WITHOUT A DARK ROOM.-

No. 43?;629. Patented Sept. 30, 18-90.

WITNESSES.

(No Model.) 38heets-Sheet 2. O. SPIRO. ART OF PHOTOGRAPHING WITHOUT A DA RK ROOM No. 437,629.

Patented Sept. 30, 1890.

Afro E78.

THE News Pitta: cm, VNOTO-LITNU, wnsmuaron, o. c.

( Head.) 3 Sheets-Sheet. 3.,

- 0. SPIRO.

ART OF PHOTOGRAPHING WITHOUT A DARK ROOM. N0. 437,629.

ATTORNEY Patentgd Sept. 30, 1890.

1n: uonms ViYIRS cm, FHOY UNITED STATES.

PATENT OFFICE.

CHARLES SPIRO, OF NEW YORK, N. Y.-

'ART OF PHOTOGRAPHING WITHOUT A DARK-ROOM.

SPECIFICATION forming part of Letters Patent No. 437,629, dated September 30, 1890.

Application filed May 6, 1889. Serial Ila-309,718. (No model.)

To all whom it may concern:

Be itlrnown thatI, CHARLES SPIRO, a citizen of the United States, residing in the city, county, and State of New York, have invented a new and useful Improvement in the Art of I Photography, of which the following is a specification.

This invention is in the nature of an improved method of photographing, by which the need of a dark-room in developing the la-; tent images of the photographic plate or sheet} is obviated, and yet a complete isolation of the undeveloped plate or sheet from .the effects of actini'c rays of light is secured, while a clear view of the image while developingis obtainable.

In developing a photographic plate or sheet in a dark-room as heretofore, in which the only Y light was the dim light admitted through ruby or orange colored glass used to exclude the actinic rays, it was possible for the operator to watch the progress of and control the development only by removing the plate or sheet from the developing-bath from time to time and holding it up to the light for inspection, which process was wearisome, and in many instances destructive to the plate, owing to the incomplete exclusion of the actinic rays and the perhaps extreme sensitiveness of the plate. 7

To avoid the use of a dark-room and overcome the other inconveniences, Irender the developing-bath, which may be of any approved description-such as pyrogallic acid and soda or hydroquinoneimpenetrable to actinic-light rays by mixing with it a non-' actinic coloring-mattersuch as carmine or orange-aniline, or both where the plate to be developed is very sensitive-which will still leave the bath transparent. A sensitive plate is transferred from the plate-containing box or package to the plate-holder without exp0sing the plate to actinic light by the use of a Y non-actinic envelope, and the plate-holder proceed in full view of the operator, who, when full development occurs, can remove the plate and transfer it to the fixing-bath, which may likewise be rendered impenetrable to actinic light by the addition thereto of the same coloring-matter.

In order that my presentinvention may be clearly understood, I will first describe in detail the manner in which it may be carried into effect, and then point out its distinctive features in the claims.

Reference is to be had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a side view, partly in section,of a novel form of camera provided with a plate holder and envelope of novel character by which the plate may be exposed before development according to myimproved method. Fig. 2 is a cross-sectional view of the same on the line 2 2, Fig. 1. Fig. 3 is a face View of the novel plate-envelope illustrated in connection with the camera in Figs. 1 and 2, part of the envelope being broken out to disclose the contained plate. Fig. 4: is a cross-sectional view of the same on the line 4 4, Fig. 3. Fig. 5 is a face view of the novel plate-holder with the said envelope applied illustrated in connection with the camera in Figs. 1 and 2. Fig. 6 is a cross-sectional view of the said plate holder and envelope and contained plate 011 the line 6 6, Fig. 5, showing the plate inclosed. Fig. 7 is a similar View showing the plate exposed. Fig. 8 is a perspective view illustrating the said plate-envelope detached from the holder and sealed after exposure of the plate. Fig. 9 is a View in sectional elevation illustrating the transfer of the plate from the envelope into the developing-bath. Fig. 10 is a cross-sectional view of the same on the line 10 10, Fig. 9. Fig. 11 is a sectionalplan view of the same.

Like letters of reference designate corresponding parts in the various figures of the drawings.

The novel manner in which I render the developing-bath A, Figs. 9, 10, and 11, perfectly impenetrable to actinic light and yet leave it clear enough to permit the progress of the development of the plate to be noted from the outside being fully set forth and claimedjn an application for a photographic developing mixture filed by me February 12, 1889, Serial No. 299,608, the same needs no further description here.

The novel actinic-light-exoluding envelope B, in which I previously inclose the sensitive photographic plate 0, which latter may be of any ordinary or approved description, and the novel form of plate-holder D, to which I detachably apply the envelope B, by Which'I open and close-the envelope to expose the plate within the camera and from which the envelope containing the affected plate isremoved, being likewise all fully described and claimed in an application for a photographic plate holder and envelope executed by me on the 4th day of May, 1889, and filed by me herewith, I will enter into no further description of the same in this application.

The novel camera E here shown, which I at present use, is also fully described and claimed in an application for a photographic camera executedby me on the 4th day of May, 1889, and filed by me herewith, and hence will not be described in this application. Any ordinary or approved form of camera may ofcourse be used in lieu of that shown.

The envelope B being removed from the camera with the contained plate 0, having the latent image, may be sealed up and inscribed with designatory marks when it is, desired to postpone the development, as fully set forth in my application fora plate-holder and envelope before referred to; or Where the plate 0 is to be developed immediately after exposure the closed envelope B containing the plate 0 is forthwith transferred to the actinic-light-excluding bath A, and the separable side of the envelope being immersed in the bath A, as shown in Figs. 9, 10, and 11, the envelope B is opened below the surface of the bath and the plate 0 permitted or caused to fully enter the bath, where it will be perfectly isolated from the eifects of actinic' light. The envelope B being then removed from the bath, and the bath A being clear and in the light, as set forth in my beforementioned application for a photographic developing mixture, the progress of the development of the latent image on the plate G can be easily noted from the outside, and when full development occurs the plate removed, as by a plate-lifter F. The developed plate may then be immersed in the fixing-bath, which may be of any usual character, and may be likewise rendered impenetrable to actinic light by the addition of coloring-matter in the same manner as the developing-bath.

In some cases I may not use the transferenvelope, but in lieu thereof transfer the plate into the actinic-light-excluding developing-bath in the dark-room, and then take the said bath with the contained plate out into the light, so as to be able to note the progress of the development.

The development of paper-prints from the plate may be accomplished in the light by means of the actinic-light-excluding developing-bath in a similar manner, if desired;

I claim as new and desire to secure by Letters Patent 1. The method of photographing without a dark-room, which consistsin transferring a sensitive photographic plate from the platepackage to the plate-holder by the use of a non-actinic envelope in applyingthe plateholder to the camera and exposing theplate therein in transferring the exposed'plate by means of a non-actinic envelope from the plate-holder to a developing-bath rendered non-actinic yet transparent, as in the manner 1 stated, and in gaging the development of the plate in the transparent non-aotinic bath in the light, substantially as set forth.

2. The improvement in the art of photography, which consists in rendering the photographic developing-bath non-actiuic yet transparent, as in the manner stated, in transferring the exposed photographic plate or sheet from the plate-holder into'the transparent non-actinic bath thus prepared without exposing the plate to actinic light, and then exposing the bath to the light while the plate therein is developing, substantially as set forth.

3. The improvement in the art of photogra- I CHARLES SPIRO.

\Vitnesses:

J. OULBERT PALMER, HENRY J MEININGER.

IOC 

